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WASHINGTON, DC - JULY 29: (L-R) Secretary of State John Kerry, Treasury Secretary Jacob Lew and Defense Secretary Ashton Carter testify before the Senate Armed Services Committee about the nuclear deal struck between Iran and six nations, including the United States, on Capitol Hill July 29, 2015 in Washington, DC. Kerry and Moniz met with the Iranians in Europe to negotiate the deal, which the Obama administration says will eliminate Iran's ability to make a nuclear weapon for at least ten years. (Photo by Chip Somodevilla/Getty Images)